city of kirkland department of public works …council/council+packets/...city of kirkland...

CITY OF KIRKLAND Department of Public Works

123 Fifth Avenue, Kirkland, WA 98033 425.587.3800

www.kirklandwa.gov

MEMORANDUM To: Kurt Triplett, City Manager From: Kathy Brown, Public Works Director Dave Snider, P.E., Capital Projects Manager Aaron McDonald, P.E., Senior Project Engineer Date: November 30, 2017 Subject: TOTEM LAKE CONNECTOR BRIDGE - PROJECT UPDATE RECOMMENDATION: City Council to:

Receive a project update along with a review of the current design elements, and Provide direction to staff on pedestrian hand railing, lighting features, and overlooks.

BACKGROUND DISCUSSION: The Totem Lake Connector (TLC) Bridge project (Project) will provide a critical link within the evolving local Totem Lake and regional non-motorized transportation network. The Project is an important component of multiple long-range planning efforts: the Totem Lake Park Master Plan, the Cross Kirkland Corridor (CKC) Master Plan, the Totem Lake Business District Plan, and the Totem Lake Neighborhood Plan. The following goals from the Cross Kirkland Corridor Master Plan provided guidance to the Project:

Connect Kirkland Shape a place unique to Kirkland

Foster a greener Kirkland

Activate Kirkland and evolve with time

Some of the project-specific city goals and objectives identified by the Project Team for the Project and identified in the June 6, 2017 City Council meeting memo are listed below:

Fulfill the Vision – Distinguish the CKC as a unique cultural and recreational

destination for the community and region. Provide an experience beyond that of

a typical regional trail. Design a structure that stands in harmony with its

surroundings and responds to the various constraints and features of the site.

Council Meeting: 12/12/2017 Agenda: Study Session Item #: 3. a.

Memo to Kurt Triplett November 30, 2017

Support Economic Development – Utilize the corridor’s development to

catalyze economic growth, encouraging residential and commercial development

that can charge the corridor and city with energy and vitality.

Connect to Regional Trails – Connecting to new and existing trail facilities will

make the CKC available to more users and regional destinations. A convenient,

direct link between the currently disconnected CKC Trail segments will greatly

increase the functionality of the trail and will attract users.

Non-Motorized Transportation Artery – The CKC will connect with

significant growth and high-density use areas to provide unimpeded travel.

Ensuring connections are made with the CKC and key streets, schools, parks,

commercial land, and transit will maximize public benefit.

Safety – The Totem Lake Connector Project will significantly improve safety by

providing CKC users with a grade-separated crossing of NE 124th Street and

Totem Lake Boulevard. Crime Prevention through Environmental Design (CPTED)

will be implemented by providing clear sightlines throughout the Project.

Create a Destination – The CKC and TLC are envisioned to become

destinations. This linear “park” with the future redevelopment of Totem Lake

Park, provides Kirkland residents and visitors with superb recreational

opportunities and an enjoyable environment to travel within and between places.

Ease of Construction/Fabrication – Minimizing traffic disruption at the

busiest intersection in Kirkland.

Minimize Environmental Impacts – Limit impacts to nearby wetlands and

natural site features.

At its June 6, 2017 meeting, City Council selected the Skipping Stone concept as the preferred alternative to advance to final design. That selection completed the initial design phase (Phase 1) where the structure type, size, and location were determined. The subsequent design work (Phase 2) has focused on refining structure details and identifying specific treatments such as railing type, deck lighting, and Totem Lake Park overlook solutions. The product of Phase 2 will be a complete set of plans and specifications suitable for grant application submittals and/or contractor bidding. Following is a discussion of the current design work with proposed options for each element, along with a preview of aesthetic (structure) lighting design ideas. The Project Team recently presented these options to the Kirkland Cultural Arts Commission for discussion and recommendation. The majority of the Commission supports the proposed designs. More detail may be found in Attachment A, TLC Current Design Work.


CURRENT DESIGN ELEMENTS - PEDESTRIAN RAILING, DECK LIGHTING, AND OVERLOOK DISCUSSION Pedestrian Railing With the desire to maintain the strong physical and structural gestures of the Skipping Stone design, the Project Team identified a number of preliminary alternatives for pedestrian safety railing that were assessed against the following criteria:

Cost Constructability Transparency/Comfort Low Climb-ability Aesthetic Implications Maintenance

When the alternatives were assessed and scored against the criteria, the Picket Fence and the Cable Net alternatives scored very favorably. Further visual assessments were conducted using computer generated images and it became clear that the Cable Net system best supports the need to provide appropriate user protection while seamlessly blending with the structure and maintaining a “light touch.” This affords a highly transparent and strong visual experience when on, or off the bridge.


Deck Lighting Deck lighting (or functional lighting) is another key design element. The same scoring method used for the railing alternatives was employed to narrow-down the lighting choices. The criteria applied to this item include:

Invisible Low Cost Vandalism Resistant Easy Installation Comfortable Lighting Low Maintenance

Scoring of the lighting alternatives revealed that a deck lighting configuration concealed within the handrail system best met the above design criteria. This alternative was further explored to determine where the lighting system should be placed. A placement within the lower part of the railing structure provides adequate lighting for users, is not distracting to roadway users below, and keeps light spill-over minimized (a “best practice” when protecting critical habitats nearby). The Project Team has included an option to add additional lighting on the opposite side of the deck in the future if higher levels of lighting are desired. However, the current concept of lighting from one side meets all applicable standards and safety lighting levels.

Cultural Arts Commission Comments Both the Cable Net railing concept, and the lower rail-mounted deck lighting system have been presented and fully discussed with the Cultural Arts Commission. At its November 15, 2017 meeting, the Commission enthusiastically endorsed the suggested approach to each item, agreeing that the Cable Net system, and the lower rail-mounted deck lighting system best meet the goals of the design, and support the goal of maintaining a strong bridge form expression.


Overlook The Project Team considered a number of potential options for overlooks. The design guidelines that defined this process are:

Experience Form and Function Spatial

Memorable Limits Shadowing of Wetland

Not too close to the Street

Exhilaration Engages Structural Form Right distance from the power lines

Unexpected Elegant as experienced from Boardwalk

Comfortable Overlook

Two areas of the bridge structure have been identified for viewing opportunities: the high-point area over the traffic island (the “Rest Area”) and the spiral-ramp area adjacent to Totem Lake (the “Overlook”). 1) Rest Area The Rest Area is a natural location to provide a moment of pause and lingering as users reach the nominal high-point of the structure. This area provides a location that can be easily widened at minimal cost while meeting the design guidelines above. The deck width has been expanded to provide over 26’ of total deck width (from 14’ trail width) at the widest point.


Rest Area Overlook Dimensions – widest point

The Rest Area can be configured in a number of ways, from leaving “as-is” in a basic concrete form, to adding interesting surface treatments to delineate the area. This area can also provide a place of stopping and resting, suitable for seating if desired.


2) Spiral-Ramp Overlook The spiral ramp area presents an unmatched opportunity to create a special experience while also maintaining the essential function of a trail. The bridge structure creates a new option to provide an intimate and unusual immersion into the park experience that does not now exist.

The Project Team has created a concept that closely adheres to the guidelines above. The “Plank” concept creates an unexpected and engaging experience in an elegant and streamlined way. It is highly complementary to the strong physical form of the bridge structure while integrating seamlessly to provide an unmatched user experience.

The majority of the Cultural Arts Commission was strongly supportive of this design approach and endorses The Plank concept.


Aesthetic (Structure) Lighting The aesthetic lighting (or structure lighting) component presents a rich opportunity to highlight the “iconic” form from afar while also enhancing the experience for the user.

Placing the lighting “inside” strongly highlights the form of the structure without the excess glare and light-waste of illuminating from “outside.” The bridge structure also presents opportunities to enhance the lighting at ground level in a muted and subdued fashion. This avoids distracting roadway users while providing an opportunity to present a less-seen part of a bridge structure that highlights the strong repetitive form that is key to an efficient and easily constructible asset.


BUDGET UPDATE: Initial project scope and cost estimate for design and construction was estimated at $12.86M. With the selection of the Skipping Stone as the preferred alternative, along with the direction to design to a 14-foot width, costs are now expected to be $17.2M. The December update to the CIP will reflect this adjustment. As a reminder, the design phase for this project was fully funded in the CIP, and $5,730,100 in City funding has been budgeted. Staff is seeking grant funding opportunities to fill the funding gap. City Council will receive a separate update on the CIP Update during the regular December 12th meeting. NEXT STEPS: The Project Team will continue to refine concepts for pedestrian railing, deck (functional) lighting, and overlook concepts. Other continuing design work includes: aesthetic (structure) lighting, stormwater infrastructure, IT infrastructure, and construction impact mitigation along with associated permits. The Project Team is also planning two more open houses to present the current work to the public and discuss the Project. The Project Team will return to City Council for a final update with the results of those open house meetings. Cost validation/Constructability Review (CV/CR) In order to provide an independent check on expected construction cost, along with providing for an outside review to identify any potential cost savings, Public Works has solicited firms to conduct a CV/CR review of the Project at the 60% design level. This review will be conducted within the next month or so. While the bridge type, size, and location have been selected, there may be opportunity to achieve additional cost saving measures while maintaining the bridge form and function. We will also review the unit bid items and unit costs to validate the current construction cost estimate. CONCLUSION: The Totem Lake Connector Bridge Project is on track to deliver final plans, specifications, and cost estimate in March, 2018. The City will use the final design documents when applying for all appropriate grant funding opportunities as they become available. The City of Kirkland’s Public Works recently teamed-up with King County to submit a $10M Tiger Grant Application for 2018 to close the Project funding gap and the results of that application will be made public in the spring of 2018. What has been created to date is a structure that connects many crucial elements of a re-developing and growing Totem Lake Neighborhood and Business District. The Project Team is seeking discussion and feedback on the selected design elements from City Council. If City Council agrees with the design direction, the Project Team will move forward with finalizing the design and final submittals.

TOTEM LAKE CONNECTOR 110.18.2017

OUTLINE - TOTEM LAKE CONNECTORGuardrail Design

Functional Lighting

Aesthetic Lighting

VIEW NORTHEAST OF PROJECT FROM NE 124TH STREET

Guardrail Design

Functional Lighting

Rest Area

The Overlook

Aesthetic Lighting

Summary

ATTACHMENT A


GUARDRAIL DESIGN

GUARDRAIL DESIGN

Functional Lighting

Aesthetic Lighting

Guardrail Design

Functional Lighting

Rest Area

The Overlook

Aesthetic Lighting

Summary


GUARDRAIL DESIGN - CRITERIA AND PRELIMINARY ALTERNATIVES

Transparency / Comfort

Low Climbability

Constructability Ease of installation

Modular design and

Maintenance

Cost

Aesthetic Implications

character

HARVEY BALL RATING

Good

Fair

Poor

N/A

CRITERIA FOR RAILING PRELIMINARY ALTERNATIVES

Average Score

Average Score

Average Score

Average Score

Maintenance Low Cost

4

4

4



44

4 4


3.2

2

23

3.0

333

333

3.7

3

3

Horizontal Cable

Perforated Metal

Picket

43

43.8

4

44

Cable Net


GUARDRAIL DESIGN - CABLE NET VS PICKET

+ +

–severed with the use of

–

+required

+

+ Clean look –

– Painting Cost

3 4 4

4 4 4

3.8

+ + Easy installation +

+ Low level of

+

3.5

3 3

4 4 3

4

+

+ Providing a visual screen along

+ +

+

Maintenance Low CostMaintenance Low Cost

CABLE NET PICKET


GUARDRAIL DESIGN - CABLE NET VS PICKET

CABLE NET PICKET

VIEW OF LOOP RAMPVIEW OF LOOP RAMP

VIEW OF SPAN 1 OVER NE 124TH STREETVIEW OF SPAN 1 OVER NE 124TH STREET


GUARDRAIL DESIGN •

is not required.

•

•

•

•

VIEW OF SPAN 1 OVER NE 124TH STREET


GUARDRAIL DESIGN - CABLE NET




INNER PLANE VIEW OF HANDRAIL ON SPAN 1 OVER NE 124TH STREET



OUTER PLANE VIEW OF HANDRAIL ON SPAN 1 OVER NE 124TH STREET


FUNCTIONAL LIGHTING

Guardrail Design

FUNCTIONAL LIGHTING

Aesthetic Lighting

Guardrail Design

Functional Lighting

Rest Area

The Overlook

Aesthetic Lighting

Summary


Average Score

Low Cost

Easy Installation Low Maintenance

222

323

2.5

–and design can result

otherwise necessary

–

reach due to low

+

–

design and installation

+ – Low light level due to low

– Standard cost

Average Score

Low Cost


323

233

2.7

–

reach due to low

–due to integrated nature

+

with the design of the stanchions

+ Low level of

+stanchions

+

–

engineering

–

C CURBB STANCHIONA HANDRAIL

Average Score

4

Low Cost


332

32

+and uncluttered due to integrated nature

–

engineering

–

– 54” Height to create glare issues over roadway and wetland

+

the handrail

+ Relatively low level of

+integrated with handrail

+light

2.8

FUNCTIONAL LIGHTING - BRIDGE MOUNTING LOCATIONS


FUNCTIONAL LIGHTING - BRIDGE MOUNTING LOCATIONS

D LOWER RAIL - RECOMMENDED

• Mounting at 54” creates a glare

challenge over the roadway and wetlands.

•

the roadway and wetlands.

• This strategy will not allow for a

•

challenges.

• This location does not create glare

• The continuous rail allows for a

•

serve as a low voltage raceway.

• Initial lighting installed on one

C CURBB STANCHIONA HANDRAIL


FUNCTIONAL LIGHTING UPPER PIPE

SUPPORT POST

CABLE NET

LINEAR LED FIXTURE

BASE PLATE

CURB

D LOWER RAIL - RECOMMENDED

• This location does not create glare

• The continuous rail allows for a

•

serve as a low voltage raceway.

• Initial lighting installed on one


FUNCTIONAL LIGHTING - LOWER RAIL




AERIAL VIEW


FUNCTIONAL LIGHTING - ADJACENT TRAIL LIGHTINGPOLE MOUNTED FIXTURES

6.3" 91"

14.8

'

Pure Innovation

The PureForm is a luminaire specifically designed around advanced

LED sources. Philips Gardco engineers have managed to harness

the power of LEDs and develop distinct, usable distributions

with maximum light and minimal energy usage. A state of the art

integral cooling system assures that LEDs are not compromised

as a result of overheating, maximizing component and LED life.

With a maximum profile of just three inches, it sets a new standard,

completely redefining what the term "low-profile" means.

Pure Style

h ll f l k d d d

P21

P32

PureForm

Site & Area

At a glance

HESS ‘LINEA’ POLE MOUNTED LED LUMINAIRE

GARDCO PUREFORM LED POLE MOUNTED LUMINAIRE


REST AREA

Overview

Rest Area

The Overlook

Aesthetic Lighting

Summary

Guardrail Design

Functional Lighting

Rest Area

The Overlook

Aesthetic Lighting

Summary

TOTEM LAKE CONNECTOR 511.15.2017 TOTEM LAKE CONNECTOR11.15.2017

REST AREA - OVERVIEW

•

• Providing a point of rest including seating at the project high point.

CONSIDERATIONS

+800’-0” of 0%-5% SLOPE

+680’-0” of 0%-5% SLOPE

REST AREA

HIGH POINT

N


REST AREA - METAPHOR

Washington and Totem Lake.

The implied sense of motion of a skipping stone towards Totem Lake expresses the reconnection between the community and nature.

deck and railing is enlarged to emphasize the skipping of the stone.

PROJECT INSPIRATION: THE SKIPPING STONE

REST AREA INSPIRATION: THE SPLASH


REST AREA - METAPHOR

Washington and Totem Lake.

The implied sense of motion of a skipping stone towards Totem Lake expresses the reconnection between the community and nature.

PROJECT INSPIRATION: THE SKIPPING STONE

REST AREA INSPIRATION: THE SPLASH

deck and railing is enlarged to emphasize the skipping of the stone.


REST AREA - ONE CONCEPT, THREE DIFFERENT EXPRESSIONS

pattern to create a dynamic visual effect and allow for ease of application.

highlights the center of the space.

01 PIXELATED RIPPLES 02 GRAPHIC RIPPLES 03 ABSTRACT RIPPLES


REST AREA - PIXELATED RIPPLE


EST AREA - PIXELATED RIPPLE

pattern to create a dynamic visual effect and allow for ease of application.


REST AREA - GRAPHIC RIPPLE


EST AREA - GRAPHIC RIPPLE


REST AREA - ABSTRACT RIPPLE


EST AREA - ABSTRACT RIPPLE

highlights the center of the space.


THE OVERLOOK

Overview

Rest Area

The Overlook

Aesthetic Lighting

Summary

Guardrail Design

Functional Lighting

Rest Area

The Overlook

Aesthetic Lighting

Summary


THE OVERLOOK - THE SPIRAL RAMP

The spiral ramp becomes one long promenade for active observation, with an ever-changing perspective, capitalizing on the elevated view over Totem Lake of the area.

The view crescendos at the mid-point of the spiral ramp, the power lines

Secondary views back to the main span structure are seen from the inner edge of the ramp.

EXPERIENTIAL OPPORTUNITES

FUTURE

EXISTING

CURRENT VIEW

FUTURE VIEW

11 15 201


THE OVERLOOK - OPTIONS

Maintain the existing width through the spiral ramp.

• Implications: None

Increase the width within the spiral ramp overlook area to 16’-0.”

• Implications:

Maintain the existing width through the spiral ramp.

• Implications: Nominal

01 PROMENADE 03 WIDENING02 SPECIAL OVERLOOK

• Lose the “skylight” gap between the tie-chord pipe and deck, which is an advantage for environmental mitigation.

• Increases the maximum grade along the inner curb face to 5%.

• More complex fabrication (loss of


Sweeping radial serpentine form presents a dynamic opportunity both in experience and visual form. This opportunity requires exceptional resolution in the structure and columns, as well as the handrail system, to execute on bridge as Structural Art.

Maintaining the integrity of the structural form, preserving strong lines and

these precedents.

STRUCTURE AS ART



STRUCTURE AS ART



THE OVERLOOK - EXPERIENTIAL GOALSActive Observation

Memorable Experience

Complimentary of Structure

Feeling of Exhilaration

Element of Surprise

Immersion in Nature


SUSPENDED OVER THE LAKE

THE OVERLOOK - EXPERIENCE ‘THE PLANK’


ER THE LAKE

• 20’-0” cantilever over the wetland, 30’-0” in the air.

• Use of bar grate to allow views through below.


• The form emerges out of the Y column complimenting the structural form.

•

• The guardrail bends outward, in keeping with the serpentine form, to create a generous active observation area.

THE OVERLOOK - EXPERIENCE ‘THE PLANK’structural form.

THE PLANK’

• The guardrail bform, to create


THE OVERLOOK - EXPERIENCE ‘THE PLANK’


AESTHETIC LIGHTING

Overview

Rest Area

The Overlook

Aesthetic Lighting

Summary

Guardrail Design

Functional Lighting

Rest Area

The Overlook

Aesthetic Lighting

Summary


AESTHETIC LIGHTING - RECAP, ‘ INNER GLOW’ CONCEPT• Illumination of 5 arch spans to capture the

gesture of the skipping stone across the roadway spans.

• The intent is to provide an understated but attractive solution that does not create a distraction for motorists.

• Fixtures mounted in a discrete way to create an inner glow of the arch pipes.

• colored ‘Aurora Borealis’ effects that contrast the consistent tone of the functional lighting.


AESTHETIC LIGHTING - SECONDARY FUNCTIONAL DOWNLIGHTING•

between cross beams to provide additional

north node.

• rendering of deck lighting to constitute a consistent color for functional lighting complimentary of RGB aesthetic lighting.


AESTHETIC LIGHTING - EXPERIENCEAs seen from the bridge deck, the contrast in color rendering between the functional lighting and aesthetic lighting is complimentary.


SUMMARY

Overview

Rest Area

The Overlook

Aesthetic Lighting

Summary

Guardrail Design

Functional Lighting

Rest Area

The Overlook

Aesthetic Lighting

Summary


SUMMARY •

requirements and experiential opportunities.

• Utilizing the amenities to compliment the structural form in keeping with the goal of creating Structural Art.

• Development of an aesthetic lighting strategy that celebrates the structure and compliments the functional lighting.


THANK YOU

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